Variable-speed transmission device.



J. R. ANDERSON. VARIABLE SPEED TRANSMISSION DEVICE.

APPLIOATIOR FILED AUG. 2. 1907.

Patented Jan. 26. 1909.

|NVENTEIR WITN E55 E5 M0? UNITED STATES PATENT OFFICE.

JOHN R. ANDERSON, OF PlTTSFIELD, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

V-ABIABLE-SPEED TRANSMISSION DEVICE.

Specification of Letters Patent.

Patented Jan. 26, 1909.

Application filed August 2, 1907. Serial No. 386,750.

Tmgsmission ,Qeyices, 18 e specification.

- y invention relates to power transmis-.

sion devices of the kind wherein a smell electric ,motpr operating at a constant speed employed to drive machines, such as sewindicates a motor w machine s,f9r examplaat variable speeds; and it has for its ob eet to simplify and unpr re t s n truetiqo o l l de ce f 8 ture? 9 nwel r d me erizmg invention will be hereinafter oint t with weenie-Pity i the shims, t for e u andin o e i ntio and elite objects and advantages reference maybe had to the following detailed descnption taken in connection with the accompanying drawing, wherein:

figure 1 IS an end iew of a motor and its ower transmitting meens ar: ranged in accordance with a preferred form of my wention, the casm eontaining the eontrolliiig switch being own n cross; section and Fig. 2 is a view taken ,at right angles Fig. 1, ortions being broken away to more clearly 1561088 the wop lging parts.

Reference being bad to the drawin 1 i ch i il s at a e 0? the d nar ph ricel p @991- molly e as f me er o 9 i s small machines or tools. urroundin the tor c s g, in

I e plane at right ang es to the motor shaft 2 and substantially midway between the motor bearings, is a rin likc bracket 3. The motor is supporter by trunnions 4 and 5 on the bracket, so as to be capable of oscillation about an axis at right a les to the axis of the armature and shaft. pen the end of the motor shaft is arranged a disk-like driving pulley 6 having its dr ving face 7 curved to conform with the surface of a sphere whose center is at the P nt o i e sect on et ee th t wa s ut hieh t d i ing P lley pted to be moved. vfrom the bracket 3 toward and slightly beyond the driving pulley are two arms 8 and 9 which are COIL? nected together near their outer ends by a second and smaller rin -1ike bracket 10 arranged parallel with the bracket 3 and forming a guard about the driving pulley. 11 is e countershaft having its axis a ranged in the plane of movement of the axis of the motor, and this countershaft carries a driven pulley 12 which engages with the driving pulley. The conntcrshaft may con veniently be supported by a frame 13 which is pivoted at one end on the end of arm 8 which is extended for this purpose. The other end of the member 13 is yicldingly secured to the arm 9 in any suitable manner This may conveniently be done by passing a screw or bolt 14 throi gh the end of the member 13 end into the end of the arm 9 and placing between the screw crbolt and the member a spr1ng l5 located n a socket 16 provided for that purpose. When the motor occupies its normal position, namely, that wherein the motor shaft is at right angles to the plane of the bracket 3, the point of engagement between the two pulleys is at the center of the driving pulley, namely directly on the axis of the motor shaft and, although this shaft may be rono movement of the driven oulley re- U on swinging the motor bodily on the point of contact bctating' sults its pivotssupports,

tween two pulleys is moved away from the enter of the driving pulley so that, when the motor is set operation, the driven pulley is rotated at a speed depending;- upon the an lo through which the motor lies lecn os oil ated. In this way, although the motor shaft may run at a constant speed, the driven pulley and 'countershaft c-rc drivenet a variajilc speed; and, by providing a dnving connection between the countcl'shaf t and a machine to be driven, the machine may be operated at a variable speed.

It will be seen that the yielding connections between the support for the driving whey and the bracket affords further means lor varying the speed, namely through adjustment of the friction between the two ullcys. The principal function of the yiel ing pressure between the pulleys, 1s, .owever, t9 m t e od d i ens mflk e tween the same even after censi ereb'le wee/r has taken place. By removing the ecrew or bolt 14, it becomes possible to swing the member 13 about its pivot and carry the "come into engagement with each other.

driven pulley out of engagement with the driving pulley.

I have shown a pair of jaws 18 and 19 projecting laterally from the arm 9 whereby the device may be clamped to the table or other art 20 of the machine which is to be driven oy the motor. Any other suitable su portmg means may, however, be employe The an lar position of the motor may be controlle in- -any suitable way as, for example, a spring 21 arranged between the motor casing and a projection 22 on the bracket may serve to hold the motor normally in the position wherein the cent-er of the drivin pulley engages with the driven pulley, and the motor may be rotated out of this normal position by means of a rod 23 which is connected to the motor casing. I prefer to rovide a slight lost motion between the ro 23 and the motor casing for the pur ose of ermitting the motor circuit to be c osed be ore the motor begins to move when the rod is o erated. To this end the upper end of t e rod may conveniently be connected to one arm of a bell crank lever 24 which is pivotall y supported on the motor casing at 25. The ot or arm 26, of this bell crank lever, is normall y held out of engagement with the motor casing by means of'a spring 27; but when the rod is pulled downward, the tension of the spring 27 is gradually overcome until the arm 26 of the bell crank lever abuts against the motor casing, whereupon further move ment of the rod compels the motor to swing on its trunnions. This initial lost motion may be utilized for closin the motor circuit in any suitable manner. lhus, for example, I may provide a switch having a fixed contact 28 and a movable arm 29 carrying a second contact 30 which, when it engages the fixed contact, closes the motor circuit. The contacts are normally held in engagement by means of a sprin 31, but, when the parts are in their norma positions and the rod is drawn upwards by means of the springs 27 and 21, a collar 32 on the rod engages with the arm of the switch and moves it so as to carry the movable contact out of engagement with the fixed contact, thus opening the motor circuit. Durin the initial downward movement of the rod before the motor begins to swing, the collar on the rod releases the switch arm and permits the contacts go 3 this arrangement the motor is permitted to start on no load.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. In combination, a bracket, a motor mounted in said bracket for oscillation about an axis at right angles to the motor shaft, a friction pulley on said shaft having a driving face curved to conform to a sphere W hose center is at the point of intersection of the axis of the motor shaft and the axis about which the motor oscillates, a countershaftmounted in said bracket, a driven pu'lley carried by said countershaft and engaging with the driving pulley, and means for conjointly oscillat-. mg said motor and closing the motor circuit comprising a reciprocating rod yieldingly connected to said motor and a switch a having its movable member in operative 611-; gagement with said rod. 1

2. In combination, a bracket, a motor mounted in said bracket for oscillating about an axis at right angles to the motor-shaft, a friction pulley on said shaft having a driving face curved to conform to a sphere whose center is at the intersection of the axis of the motor shaft and the axis about which the motor oscillates, a countershaft mounted in said bracket, a driven pulley on said countershaft, and means for conjointly oscillating said motor and closing the motor circuit comprising a reciprocating rod yieldingly connected to said motor and a switch having its movable member in operative engagement with said rod.

3. In combination, a bracket, a motor mounted in said bracket for oscillating about an axis at right angles to the motor shaft, a friction pulley on said shaft having a driving face curved to conform to a sphere whose center is at the intersection of the axis of the motor shaft and the axis about which the motor oscillates, a member hinged to said bracket, and a driven pulley mounted on said member and thereby held in engagement with the-driving pulley.

4. In combination, a bracket, a motor mounted in said bracket for oscillating about an axis at right angles to the motor shaft, a friction pulley on said shaft having a driving face curved to conform to a sphere whose center is at the intersection of the axis of the motor shaft and the axis about which the motor oscillates, an arm hinged at one end to said bracket and yieldingly connected to the bracket at the other end, and a driven pulley carried by said arm and thereby held in engagement with the driving pulley.

5. in combination, a bracket, a motor mounted therein for oscillating about an axis at right angles to the motor shaft, a friction pulley on said shaft having its driving face curved to conform to the surface of a sphere whose center is at the point of intersection of the axis about which the motor oscillates and the axis of the motor shaft, a driven pulley mounted in said bracket for rotation about an axis lying in the plane in i which the motor shaft swings, means for holding said pulleys in engagement with each other, and means for conjointly oscillating said motor and closing the motor circuit comprising a reciprocating rod yieldingly connected to said motor and a switch having its movable member in operative engaget ment with said rod.

6. In combination, a motor, a ring surin engagement with the side of the driving rounding said motor, pivotal supports for pulley opposite the motor. 10 the motor on the ring for pernrittfiig the is witeess where-oi,- have hereunt et motor to oscillate about an axis at r' ht anmy hand this twenty ninth day of July, 1907.

5 gles to the motor shaft, a friction pu ley on JOHN R. ANDERSON.

the end of the motor shaft, arms extending Witnesses: from one side of said ring, and a driven FRANK M. WRIGHT,

pulley mounted'between said arms and held FLORENCE L. SNOW. 

